diff --git a/s3tests_boto3/functional/test_sts.py b/s3tests_boto3/functional/test_sts.py
index 0c66121..4799f14 100644
--- a/s3tests_boto3/functional/test_sts.py
+++ b/s3tests_boto3/functional/test_sts.py
@@ -86,7 +86,7 @@ def test_get_session_token():
     user_policy = "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Deny\",\"Action\":\"s3:*\",\"Resource\":[\"*\"],\"Condition\":{\"BoolIfExists\":{\"sts:authentication\":\"false\"}}},{\"Effect\":\"Allow\",\"Action\":\"sts:GetSessionToken\",\"Resource\":\"*\",\"Condition\":{\"BoolIfExists\":{\"sts:authentication\":\"false\"}}}]}"
     (resp_err,resp)=put_user_policy(iam_client,sts_user_id,None,user_policy)
     eq(resp['ResponseMetadata']['HTTPStatusCode'],200)
-    response=sts_client.get_session_token(DurationSeconds=43200)
+    response=sts_client.get_session_token()
     eq(response['ResponseMetadata']['HTTPStatusCode'],200)
     s3_client=boto3.client('s3',
                 aws_access_key_id = response['Credentials']['AccessKeyId'],
@@ -116,7 +116,7 @@ def test_get_session_token_permanent_creds_denied():
     user_policy = "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Deny\",\"Action\":\"s3:*\",\"Resource\":[\"*\"],\"Condition\":{\"BoolIfExists\":{\"sts:authentication\":\"false\"}}},{\"Effect\":\"Allow\",\"Action\":\"sts:GetSessionToken\",\"Resource\":\"*\",\"Condition\":{\"BoolIfExists\":{\"sts:authentication\":\"false\"}}}]}"
     (resp_err,resp)=put_user_policy(iam_client,sts_user_id,None,user_policy)
     eq(resp['ResponseMetadata']['HTTPStatusCode'],200)
-    response=sts_client.get_session_token(DurationSeconds=43200)
+    response=sts_client.get_session_token()
     eq(response['ResponseMetadata']['HTTPStatusCode'],200)
     s3_client=boto3.client('s3',
                 aws_access_key_id = s3_main_access_key,